This article is devoted to the issues of modelling and forecasting corporate income tax revenues in Latvia. Procedure of calculation of corporate income tax payments is different as for most taxes, therefore it requires adjustments also to modelling approaches, which are traditionally used for tax revenues forecasting. It is necessary to distinguish between advance payments (usually monthly payments) and final tax payments made in March, April or May. Advance payments depend on previous tax payments adjusted for inflation, but final payments depend on profit. For econometric equations other factors are considered as well. All the analysed methods give similar annual forecasts – between 342.3 and 359.2 m EUR. However, it is important, how they are distributed monthly.